DIPTERA. 247 



clothed with black hairs above the base of the feelers and on the tubercle 

 of the eyelets: eyes black: mouth pitchy: feelers pitchy; sixth joint 

 tawny, black towards the tip : chest clothed with tawny hairs ; scutcheon 

 tawny : breast grayish : abdomen deep black, obconical, a little shorter than 

 the chest, adorned with two larye tawny spots on each side of the second and 

 third segments ; hind borders of the segments tawny ; underside taivny with 

 a black tip : legs tawny, clothed with short tawny hairs ; feet and tips of 

 the shanks clothed with black hairs ; thighs black with tawny tips ; tips of 

 the shanks and of the feet black ; foot-cushions and claws tawny ; tips of 

 the claws black : winys colourless, broivn at the base, xvith a slight tawny 

 tinge along the fore border ; brands pale brown ; wing-ribs pitchy ; veins 

 black, pitchy at the base. Length of the body 4 lines ; of the wings 8 

 lines. 



North America. 



Eristalis Chalepus, Fem. 



Nigro-fuseus, thorace vittis diiabus caiiis abbreviatis ornato, abdomine 

 macnlis dnabus fulvis fasciisqne tribus pallidioribus, segmentorum 

 marginibus posticis venfreque plumbeis, anlennis nigris apice piceis, 

 pedibus nigris, iibiis fulvis, alis subcinereis basi et ad costam sub- 

 fulvis. 



Black : head covered with pale buff down, clothed with pale buflf 

 hairs and on the crown with black hairs ; face with the usual bare shining 

 stripe which is raised along the whole length until near the feelers ; eyes 

 black : mouth black ; tips of the palpi and of the maxillae tawny : feelers 

 black; third joint pitchy; sixth tawny with a black tip: chest brown, 

 clothed with tawny hairs, adorned with two hoary stripes which do not ex- 

 tend beyond half the length from the fore border : abdomen obconical, a 

 little longer and broader than the chest, adorned ivith three slender pale 

 biiff' interrupted bands, and on each side near the base with a large somewhat 

 triangular tawny spot whose inner border is concave ; the first and the second 

 bands form curves on each side, the third is near the tip and very small ; 

 hind borders of segments and whole of underside lead-colour, shining : legs 

 black, clothed with short black hairs ; shanks tawny, clothed with tawny 

 hairs towards the base ; shanks and feet covered beneath witii tawny down : 

 u'ings pale gray, slightly tawny at the base and along the fore border ; brands 



